DALLAS (AP) — Before December 2016, when he was staggered by the first of what would be multiple strokes, T. Boone Pickens was among the busier and more vibrant 88-year-olds on the planet.

The Tulsa World reports five days a week, there were 6:30 a.m. treadmill-and-weights workouts. During a typical Friday, he might have breakfast in Dallas, lunch in New York and dinner at his 68,000-acre Mesa Vista ranch in the Texas Panhandle.

Now, his routine includes frequent sessions of speech and physical therapy.

A Holdenville, Oklahoma, native, Pickens turned 90 on Tuesday.

Any profile of Pickens inclu...